Improve the Jitsi meeting button UX

Widgets support is incredibly useful and so is this button, but it has a
few problems. The most obvious is that it's still enabled even if you
don't actually have the permission to start Jitsi meetings, so I fixed
that. I also made sure it's hidden when viewing spaces too.

Another problem is that you can't easily tell if a meeting is currently
in progress either, nor do we have a good icon for that in Breeze. So I
changed the tooltip and colored the icon in this case.

The final problem I fixed is something not exclusive to NeoChat, but
generally all chat applications with this feature - there's no
confirmation! To stop "butt-dialing" random people or rooms, I added a
prompt before starting or joining a meeting.

src/app/CMakeLists.txt

@@ -103,6 +103,7 @@ ecm_add_qml_module(neochat URI org.kde.neochat GENERATE_PLUGIN_SOURCE
         qml/ReasonDialog.qml
         qml/NewPollDialog.qml
         qml/UserMenu.qml
+        qml/MeetingDialog.qml
     DEPENDENCIES
         QtCore
         QtQuick

src/app/qml/MeetingDialog.qml

@@ -0,0 +1,22 @@
+// SPDX-FileCopyrightText: 2025 Joshua Goins <josh@redstrate.com>
+// SPDX-License-Identifier: GPL-3.0-only
+
+import QtQuick
+
+import org.kde.kirigami as Kirigami
+
+Kirigami.PromptDialog {
+    id: root
+
+    required property bool hasExistingMeeting
+
+    title: hasExistingMeeting ? i18nc("@title", "Join Meeting") : i18nc("@title", "Start Meeting")
+    subtitle: hasExistingMeeting ? i18nc("@info:label", "You are about to join a Jitsi meeting in your web browser.") : i18nc("@info:label", "You are about to start a new Jitsi meeting in your web browser.")
+    standardButtons: Kirigami.Dialog.Cancel
+
+    customFooterActions: Kirigami.Action {
+        icon.name: "camera-video-symbolic"
+        text: hasExistingMeeting ? i18nc("@action:button Join the Jitsi meeting", "Join") : i18nc("@action:button Start a new Jitsi meeting", "Start")
+        onTriggered: root.accept()
+    }
+}

src/app/qml/RoomPage.qml

@@ -77,11 +77,33 @@ Kirigami.Page {
 
     actions: [
         Kirigami.Action {
-            tooltip: i18nc("@action:button", "Open Jitsi Meet in browser")
+            id: jitsiMeetingAction
-            icon.name: "camera-video-symbolic"
+
+            readonly property bool hasExistingMeeting: root.widgetModel.jitsiIndex >= 0
+            readonly property bool canStartNewMeeting: root.currentRoom.canSendState("im.vector.modular.widgets")
+
+            tooltip: {
+                if (hasExistingMeeting) {
+                    return i18nc("@action:button", "Join Jitsi meeting…");
+                }
+
+                return canStartNewMeeting ? i18nc("@action:button", "Start Jitsi meeting…") : i18nc("@action:button", "You do not have permissions to start Jitsi meetings")
+            }
+            icon {
+                name: "camera-video-symbolic"
+                color: hasExistingMeeting ? Kirigami.Theme.highlightColor : "transparent"
+            }
+            enabled: hasExistingMeeting || canStartNewMeeting
+            visible: root.currentRoom && !root.currentRoom.isSpace
             onTriggered: {
-                let url
+                const dialog = Qt.createComponent("org.kde.neochat", "MeetingDialog").createObject(QQC2.Overlay.overlay, { hasExistingMeeting });
-                if (root.widgetModel.jitsiIndex < 0) {
+                dialog.onAccepted.connect(doAction);
+                dialog.open();
+            }
+
+            function doAction(): void {
+                let url;
+                if (!hasExistingMeeting) {
                     url = root.widgetModel.addJitsiConference();
                 } else {
                     let idx = root.widgetModel.index(root.widgetModel.jitsiIndex, 0);